End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
http://karamodir.farafile.ir/file/28313/پاورپوینت-(اسلاید)-فصل-دهم-علوم-تجربی-پایه-هشتم-(مغناطیس)